Hi Ed.
How can you be sure that lpAdapter is not NULL?
The error message you sent seems an access to a null pointer....
I've tried to replicate this issue on my machine, and a similar problem occurs if lpAdapter is NULL.
Have a nice day GV
----- Original Message ----- From: "Ed Remmell" <[EMAIL PROTECTED]>
To: <winpcap-users@winpcap.polito.it>
Sent: Saturday, January 15, 2005 2:17 AM
Subject: [WinPcap-users] Bug in v3.1beta4 of winpcap? Crash when open and close WAN adapter
Dear winpcap team -
On Win32 (I'm running Win XP Pro with the latest MS service packs applied), I've noted that your latest v3.1beta4 release of winpcap will crash if I execute the following sequence of packet.dll API calls on a WAN adapter:
lpAdapter = PacketOpenAdapter(adapterName); PacketCloseAdapter(lpAdapter);
lpAdapter is of course not NULL. After the call to PacketOpenAdapter, I look at the structure that lpAdapter points to and lpAdapter->pWanAdapter is non-NULL, indicating that it is a WAN adapter. adapterName in this case is "\Device\NPF_GenericNdisWanAdapter".
When the code crashes somewhere in PacketCloseAdapter, the error message I get in the Microsoft Visual C++ debugger is:
"Unhandled exception at 0x7c918fea in TreckDemo32d18.exe: 0xC0000005: Access violation writing location 0x00000010."
If I try this exact same sequence of calls with a non-WAN adapter (lpAdapter->pWanAdapter is NULL), it works perfectly fine.
I'm not exactly sure how I'm going to code around this problem. Right now, what comes to mind is doing a string search in the adapterName to look for "WanAdapter" and if found then don't try opening the adapter because of this bug. That's obviously a hack, I'd prefer if you instead fix this.
Thanks. - Ed Remmell
Treck, Inc. (formerly Elmic Systems, USA)
Best of Show Winner, ESC 2003
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